NEW AC DELCO OPTISPARK NEW WIRES NEW PLUGS ALL ...

  • Tiny
  • Paulypet001
  • 1994 Cadillac Fleetwood
  • 24,000 miles

New ac delco opti-spark, new wires, new plugs all ac delco, new ignition coil new fuel pump new intake gasket new head gaskets , new maf (air intake), after it warms up it does slight little jerks, like cruising at 65 then give the slightest bit of pedal and it jerks kinda slight miss if you stomp on it it run great, it's like trying to give the least amount of pedal to see when it will down shift then it will start coughing!

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Sunday, January 13th, 2013 AT 12:36 AM

5 Replies

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

Have the injectors cleaned with direct injection cleaner, not any additives. They may be dirty or need replacing

Roy

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Sunday, January 13th, 2013 AT 1:35 AM
  • Tiny
  • Paulypet001
  • Member

Yes there clean around 42 ponds pressure on each one

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Sunday, January 13th, 2013 AT 1:39 AM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

Ok, how do you know this? Pressure can be good but if the spray pattern is off, this is the result.

Roy

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Sunday, January 13th, 2013 AT 1:40 AM
  • Tiny
  • Paulypet001
  • Member

Yes there clean around 42 ponds pressure on each one when the mechanic tested all them not sure how he did it? It was after the fuel pump and sending unit was replaced then he did a smoke test? And found the intake gasket had a leak

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Sunday, January 13th, 2013 AT 1:45 AM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

Ok, you still dont get it. Pressure is not an issue. Unless he took the rail up and observed all the spray patterns, you cannot be sure of the actual pattern.

Assuming all his other work is correctly done, you are down to this with the injectors. He can do a test which he hooks up the pressure gauge and manual fires each injector and observes how much pressure drops on each. Then you can determine which ones do not have enough flow

Roy

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Sunday, January 13th, 2013 AT 1:49 AM

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